Ok here is a listing of total narrator comments (I won't count cedric comments, he has usually 1-3 per screen, plus the random ones he says, if you stand around doing nothing). Some comments are automatic when you enter or leave a screen, and some activated by attempting to talk to him. I'm mostly going to list the "look icon" comments per screen.
So basically I've noticed going through KQ5, is that in screens where Cedric doesn't show up, there are less Xs on screen. You tend to get a global description for the screen (generally can look at most areas on the screen to pull it up). For example many of the desert, the brushland or dark forest areas. Some of the desert screens you get a single generic global description (granted that's because the screen doesn't really have much to see but miles of sand dunes), but grows to two or three if you are in an Oasis, skeleton or near the northern cliffs screens. You do get some Xs on the temple oasis screen (mostly around the sand and sky), but there are are four things to look at around the screen (so it evens out). Infact you get a brief mention of the "desert floor" when you look at the cliffs, and since you could look at the desert floor in every other cliff screen, its not really missing. In the temple screen itself, you can look at three things (this includes a global description with no Xs) Inside the temple, lots of xs around the floor, but four things you can look at (plus a door closing warning, you have very little time to actually look at anything). But that's actually a fairly decent number of narrative details all things considered.
The elves cave has six things to see (including global description, and no Xs), pretty decent total.
There are some x in areas of the bandit camp (in the sandy portions). You can however still look at a total of four-eight things on screen (depending on when you visit the camp), so it rather balances out (actually the sand doesn't really count since you can look at sand everywhere else :p). Inside the tent there is a global description, and couple of things to look at.
Inside the town there are 6 or 7 things to look at going around the town (including a global description, and no Xs) That's actually pretty decent. Each of the shops themselves have at global description and 4-7 things to look at as well, also pretty good.
The Dark Forest, well the starting screen has 2-3 things to look at (one is a global description, no Xs on screen). Each screen the main forest screens has 3-5 things to see (all have global descriptions, no Xs). The witches house screen has a total of 6-9 things to look at (including a global description no Xs). Inside the house has 5-6 things to look at (including global description no Xs.) The tree screen has 3-4 things to see, but quite a few Xs around the edges. The forest exit screen has, 2 things to see on screen (including the global description no Xs). Each screen more or less has the same average amount of things to see, with only the heart tree having Xs.
If Cedric is on the screen, you tend to get more Xs in various places on the screen. Generally there are maybe are least 3-4 things you can see on screen. But this is not always the case, he's pretty talkative on the Inn screen, but you can literally look at 8-9 things in the screen. There are a few spaces of Xs around the grass and the sky (but the total number of things to look at evens it out a bit). Some of the totals are "ranges", as in it might be more or less depending on what's going on in the screen. Sometimes more things appear on screen than other times. I will be pointing out Xs regions as well (most appear in rather pointless areas like grass or the sky, or ground or floor in some places). INside the inn front room there are 5 things to look at (including a global description no Xs), the celler has 2-3 things to look at (including hte global description), the kitchen has 5-6 things to look at (including the global description).
Other screens counting the various Serenia woods screens (antill, honey tree, gypsy caravan, etc), have 3-4 things to look at (sometimes more). The gypsy screen has like 5 things to look at (initially, 2-3 things to look at after it leaves including a global description), the ant hill screen has 3-4, the bee tree has about 5-6. The willow screen has 4 or so. dark forest sign screen has 5-6 things to look at. The area with Herbert has 3-4 things to look at (including a global description for the entire screen no Xs), the snake screen has 2-3 things (including a global description for the entire screen no Xs). The gnome home screen has 6-8 things to look at, but lots of Xs, the total number of things on screen kinda of evens it out however.
On the Bakehouse screen there are 7-8 things to look at (so all in all pretty decent number of narration points). Again a few spaces of X's around grass and sky (but most things are interactive). Inside you there are about five things to look at (including a global description, not Xs)
On the outside of town screen, there are about 7 things to look at. There are some Xs around the sky and grass, but all in all it has a pretty decent number of interactive spots.
Ocassionally Cedric will speak up, if you try to interact with something on screen. The Universe Interpreter for example
Sometimes he will only speak up if something important is going on in the screen, I.E. another NPC pops up, the Bear, the Dog, etc.
Anyways I'll continue with counting the moutains, sea and islands later. However on average seems to vary between having as many narrative bits as KQ6 has for each of its screens, or in some cases having twice as many narrative points in the screens. The Xs so far more or less are located in pointless areas without much to actually see (sky, ground or grass, occasinally the top of a tree)... Its surprising why they didn't just bother to just use a "global-like descriptions" just cover those spaces. There are already messages in each of those screens that would have worked well as a global description.
Infact if you count cedric's narrations there are actually generally more things described than are descdribed in KQ6 or earlier KQ games on average in those screens, best I can tell. You basically jump each screens total by 2-3 extra descriptions. So between 5-12 descriptions or so (which is actually pretty descent if you compare to both earlier games and KQ6).